Plant supporting device



FIG. 1 is a perspective view showing the top side of a plant supporting device showing my new design;

FIG. 2 is a perspective view showing the bottom side thereof;

FIG. 3 is a side view thereof, the opposite side view thereof being identical;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a plant supporting device, as shown and described. 